[misc] relicense the sources that can be relicensed to GPLv2+

* This commit relicenses most of the sources found under ./src/ to GPLv2+.
* This is accomplished by following all the legal procedures for relicensing,
  which includes:
  - Obtaining a formal written authorization to relicense their code from
    any external contributors to the relevant source files (which we did).
  - Demonstrating that the original source (if any) on which derivative
    work was applied was using a license that is compatible with GPLv2+.
  - Removing any elements that could not be explicitly relicensed (such as
    the str###a() function calls from missing.c).
* Note that this does *not* mean that the project itself has been relicensed
  to GPLv2+, as it is still derived from GRUB 2.0, which is GPLv3+. It only
  means that the files, that are now explicitly stated as such, can be reused
  in GPLv2+ compatible works.

README.md

@@ -54,18 +54,12 @@ For additional info as well as precompiled drivers, see https://efi.akeo.ie
   ```
   build -a X64 -b RELEASE -t <toolchain> -p EfiFsPkg/EfiFsPkg.dsc
   ```  
-  where `<toolchain>` is something like `VS2015` (Windows) or `GCC5` (Linux).  
+  where `<toolchain>` is something like `VS2019` (Windows) or `GCC5` (Linux).  
   NB: To build an individual driver, such as NTFS, you can also use something
   like:  
   ```
   build -a X64 -b RELEASE -t <toolchain> -p EfiFsPkg/EfiFsPkg.dsc -m EfiFsPkg/EfiFsPkg/Ntfs.inf
   ```
-* Note that, provided that you cloned a recent EDK2 from git, you should be able
-  to use `VS2019` as your EDK2 toolchain, including for buidling the ARM or
-  ARM64 drivers, with something like:
-  ```
-  build -a AARCH64 -b RELEASE -t VS2019 -p EfiFsPkg/EfiFsPkg.dsc
-  ```
 * A Windows script to build the drivers, using EDK2 with VS2019 is also provided
   as `edk2_build_drivers.cmd`.
 
@@ -102,6 +96,11 @@ This is a pure GPLv3+ implementation of EFI drivers. Great care was taken not to
 use any code from non GPLv3 compatible sources, such as rEFInd's `fsw_efi`
 (GPLv2 only) or Intel's FAT driver (requires an extra copyright notice).
 
+Note however that some files (the non `grub_####` sources under `./src/`) are
+licensed under GPLv2+ rather than GPLv3+ and that, just like the GPLv3+ sources,
+we took great care of ensuring that we are fully compliant with any licensing
+or relicensing matters, so that they can legally be reused into GPLv2+ works.
+
 ## Bonus: Commands to compile EfiFs using EDK2 on a vanilla Debian GNU/Linux 10.x
 
 As root:

debug.vbs

@@ -1,4 +1,18 @@
 ' Visual Studio QEMU debugging script.
+' Copyright © 2014-2021 Pete Batard <[email protected]>
+'
+' This program is free software: you can redistribute it and/or modify
+' it under the terms of the GNU General Public License as published by
+' the Free Software Foundation, either version 2 of the License, or
+' (at your option) any later version.
+'
+' This program is distributed in the hope that it will be useful,
+' but WITHOUT ANY WARRANTY; without even the implied warranty of
+' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+' GNU General Public License for more details.
+'
+' You should have received a copy of the GNU General Public License
+' along with this program.  If not, see <http://www.gnu.org/licenses/>.
 '
 ' I like invoking vbs as much as anyone else, but we need to download and unzip a
 ' bunch of files, as well as launch QEMU, and neither Powershell or a standard batch

src/driver.c

@@ -4,9 +4,14 @@
  *  Based on iPXE's efi_driver.c and efi_file.c:
  *  Copyright © 2011,2013 Michael Brown <[email protected]>.
  *
+ *  Note: This file has been relicensed from GPLv3+ to GPLv2+ by formal
+ *  agreement of all of the contributors who applied changes on top of
+ *  its original GPLv2+ source. The original source can be found at:
+ *  https://github.com/ipxe/ipxe/blob/26029658063dcafcca746640a28a76d4f7f4a66e/src/interface/efi/efi_driver.c
+ *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
+ *  the Free Software Foundation, either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,

src/driver.h

@@ -2,9 +2,12 @@
 /*
  *  Copyright © 2014-2020 Pete Batard <[email protected]>
  *
+ *  Note: This file has been relicensed from GPLv3+ to GPLv2+ by formal
+ *  agreement of all of its contributors.
+ *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
+ *  the Free Software Foundation, either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
@@ -205,9 +208,7 @@ extern CHAR16 *ShortDriverName, *FullDriverName;
 extern GRUB_MOD_INIT GrubModuleInit[];
 extern GRUB_MOD_EXIT GrubModuleExit[];
 
-extern VOID strcpya(CHAR8 *dst, CONST CHAR8 *src);
-extern CHAR8 *strchra(const CHAR8 *s, INTN c);
-extern CHAR8 *strrchra(const CHAR8 *s, INTN c);
+#define strcpya(dst, src) CopyMem(dst, src, strlena(src) + 1)
 extern VOID SetLogging(VOID);
 extern VOID PrintStatus(EFI_STATUS Status);
 extern VOID GrubDriverInit(VOID);

src/file.c

@@ -4,9 +4,14 @@
  *  Based on iPXE's efi_driver.c and efi_file.c:
  *  Copyright © 2011,2013 Michael Brown <[email protected]>.
  *
+ *  Note: This file has been relicensed from GPLv3+ to GPLv2+ by formal
+ *  agreement of all of the contributors who applied changes on top of
+ *  its original GPLv2+ source. The original source can be found at:
+ *  https://github.com/ipxe/ipxe/blob/26029658063dcafcca746640a28a76d4f7f4a66e/src/interface/efi/efi_file.c
+ *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
+ *  the Free Software Foundation, either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
@@ -128,7 +133,7 @@ FileOpen(EFI_FILE_HANDLE This, EFI_FILE_HANDLE *New,
 			path[i] = '/';
 	}
 
-	/* We only want to handle with absolute paths */
+	/* We only want to handle absolute paths */
 	clean_path[0] = '/';
 	/* Find out if we're dealing with root by removing the junk */
 	CopyPathRelative(&clean_path[1], path, MAX_PATH - 1);

src/logging.c

@@ -2,9 +2,12 @@
 /*
  *  Copyright © 2014-2017 Pete Batard <[email protected]>
  *
+ *  Note: This file has been relicensed from GPLv3+ to GPLv2+ by formal
+ *  agreement of all of its contributors.
+ *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
+ *  the Free Software Foundation, either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,

src/missing.c

@@ -1,12 +1,16 @@
 /* missing.c - Missing convenience calls from the EFI interface */
 /*
- *  Copyright © 2014-2017 Pete Batard <[email protected]>
- *  Based on GRUB  --  GRand Unified Bootloader
- *  Copyright © 1999-2010 Free Software Foundation, Inc.
+ *  Copyright © 2014-2021 Pete Batard <[email protected]>
  *
+ *  NB: This file was relicensed from GPLv3+ to GPLv2+ by its author.
+ *  Per https://github.com/pbatard/efifs/commit/6472929565970fc88fbad479c5973898c3275235#diff-e4e188b933de262cfdf4c2be771da37b2ec89ba97d353a16352c6eebb41a286f
+ *  you can confirm that we did remove the initial 3 function calls
+ *  that were derived from GPLv3+ work, thus granting us the ability
+ *  to relicense this file.
+ * 
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
+ *  the Free Software Foundation, either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
@@ -25,39 +29,6 @@
 #pragma comment(linker, "/INCLUDE:_MultS64x64")
 #endif
 
-VOID
-strcpya(CHAR8 *dst, CONST CHAR8 *src)
-{
-	INTN len = strlena(src) + 1;
-	CopyMem(dst, src, len);
-}
-
-CHAR8 *
-strchra(const CHAR8 *s, INTN c)
-{
-	do {
-		if (*s == c)
-			return (CHAR8 *) s;
-	}
-	while (*s++);
-
-	return NULL;
-}
-
-CHAR8 *
-strrchra(const CHAR8 *s, INTN c)
-{
-	CHAR8 *p = NULL;
-
-	do {
-		if (*s == c)
-			p = (CHAR8 *) s;
-	}
-	while (*s++);
-
-	return p;
-}
-
 EFI_STATUS
 PrintGuid(EFI_GUID *Guid)
 {

src/path.c

@@ -1,11 +1,16 @@
 /* path.c - Path handling routines */
 /*
- *  Copyright © 2014 Pete Batard <[email protected]>
+ *  Copyright © 2014-2021 Pete Batard <[email protected]>
  *  Based on path sanitation code by Ludwig Nussel <[email protected]>
  *
+ *  Note: This file has been relicensed from GPLv3+ to GPLv2+ by formal
+ *  agreement of all of the contributors who applied changes on top of
+ *  its original Public Domain source. The original source can be found at:
+ *  https://github.com/saygili/pisilinux/blob/65c6b72d90aa282d8a3e79be209fa364c7180ffc/extra/util/archive/unarj/files/unarj-2.65-sanitation.patch#L4-L86
+ *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
+ *  the Free Software Foundation, either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
@@ -38,8 +43,8 @@ VOID CopyPathRelative(CHAR8 *dest, CHAR8 *src, INTN len)
 	for(; len && *p;)
 	{
 		src = p;
-		p = strchra(src, PATH_CHAR);
-		if(!p) p = src+strlena(src);
+		while (*p && *p != PATH_CHAR) p++;
+		if (!*p) p = src+strlena(src);
 
 		/* . => skip */
 		if(p-src == 1 && *src == '.' )
@@ -51,21 +56,12 @@ VOID CopyPathRelative(CHAR8 *dest, CHAR8 *src, INTN len)
 		{
 			if(o != dest)
 			{
-				CHAR8* tmp;
+				UINTN i;
 				*o = '\0';
-				tmp = strrchra(dest, PATH_CHAR);
-				if(!tmp)
-				{
-					len += o-dest;
-					o = dest;
-					if(*p) ++p;
-				}
-				else
-				{
-					len += o-tmp;
-					o = tmp;
-					if(*p) ++p;
-				}
+				for(i = strlena(dest)-1; i > 0 && dest[i] != PATH_CHAR; i--);
+				len += o-&dest[i];
+				o = &dest[i];
+				if(*p) ++p;
 			}
 			else /* nothing to pop */
 				if(*p) ++p;

src/this.c

@@ -2,9 +2,12 @@
 /*
  *  Copyright © 2014-2017 Pete Batard <[email protected]>
  *
+ *  Note: This file has been relicensed from GPLv3+ to GPLv2+ by formal
+ *  agreement of all of its contributors.
+ *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
+ *  the Free Software Foundation, either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,

src/utf8.c

@@ -4,9 +4,14 @@
  *  Based on Netscape security libraries:
  *  Copyright © 1994-2000 Netscape Communications Corporation.
  *
+ *  Note: This file has been relicensed from GPLv3+ to GPLv2+ by formal
+ *  agreement of all of the contributors who applied changes on top of
+ *  its original GPLv2+ source. The original source can be found at:
+ *  https://github.com/mozilla/gecko-dev/blob/9fd7059a19baa49b01a534eddf9a5a4de918a9f9/security/nss/lib/util/utf8.c
+ *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
+ *  the Free Software Foundation, either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,